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Unveiling an ancient whole-genome duplication event in Stentor,the model unicellular eukaryotes

Science China Life Sciences 2025年

作者： Weibo Zheng Chao Li Zhaorui Zhou Xiao Chen michael Lynch Ying Yan School of Life Sciences Ludong University Key Laboratory of Evolution & Marine Biodiversity (Ministry of Education) and Institute of Evolution & Marine Biodiversity Ocean University of China Biodesign Center for Mechanisms of Evolution Arizona State University Marine College Shandong University

Whole-genome duplication(WGD) events are widespread across eukaryotes and have played a significant role in moulding the genetic architectures of diverse organisms. In the present study, the newly sequenced genome of a giant ciliated protist, Stentor roeselii, provides an opportunity for the analysis of the collinearity and retention of reciprocal best-hit genes between two Stentor species. As a main result, we have unveiled a previously undetected ancient WGD event shaping the genome of its congener, Stentor coeruleus, a model protist used in cytological and evolutionary studies. Genomes of two congeners, S. coeruleus and S. roeselii, are compared and analyzed, revealing that:(i)the former exhibits a much higher retention rate of colinear-gene pairs(28%) than does S. roeselii, and in S. coeruleus, 75% of genes that have a RBH hit in S. roeselii, have paralogs with high amino-acid identity, consistent with a WGD event in the lineage leading to S. coeruleus;(ii) the S. roeselii genome possesses extremely short intergenic regions, implying that the lengths of intergenic regions are under strong selection;(iii) the unique characteristics of introns may have been shaped in the common ancestor of heterotrichs;(iv) gene families that play a role in activities of multiple protein kinases and voltage-gated ion channels expanded rapidly in the ancestor of both taxa, possibly relating to the remarkable regenerative ability in Stentor. This study offers new insights into the evolutionary dynamics of ciliate genomes,with implications for understanding of the processes underlying the evolution of genomic complexity.

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Pressure Evolution of the Magnetism and Fermi Surface of YbPtBi Probed by a Tunnel Diode Oscillator Based Method

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Chinese Physics Letters 2022年第9期39卷 41-46页

作者： Y.E.Huang F.Wu A.Wang Y.Chen L.Jiao M.smidman H.Q.Yuan Center for Correlated Matter and Department of Physics Zhejiang UniversityHangzhou 310058China Zhejiang Province Key Laboratory of Quantum Technology and Device Department of PhysicsZhejiang UniversityHangzhou 310058China State Key Laboratory of Silicon Materials Zhejiang UniversityHangzhou 310058China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093China

A central research topic in condensed matter physics is the understanding of the evolution of various phases and phase transitions under different tuning parameters such as temperature, magnetic field and pressure. To explore the pressure-induced evolution of the magnetism and Fermi surface of the heavy fermion antiferromagnet Yb Pt Bi, we performed tunnel diode oscillator based measurements under pressure at low temperatures in high magnetic fields. Our results reveal that the magnetic order strengthens and the Fermi surface shrinks as the pressure increases, which are consistent with typical observations for Yb-based heavy fermion compounds. In addition, an anomalous change in the quantum oscillation amplitudes is observed above 1.5 GPa, and determining the origin requires further study.

关键词： Fermi Probe oscillation

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***,vision-based navigation and the PG master’s degree programme at HfT Stuttgart

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Geo-Spatial Information Science 2023年第2期26卷 156-159页

作者： michael Hahn Faculty of Geomatics Computer Science and MathematicsStuttgart University of Applied SciencesStuttgartGermany

The two topics of the article seem to have absolutely nothing to do with each other and,as can be expected in a contribution in honor and memory of *** Ackermann,they are linked in his ***-based Navigation was the focus of the doctoral thesis written by the author,the 29th and last PhD thesis supervised by *** International Master’s Program Photogrammetry and Geoinformatics,which the author established with colleagues at Stuttgart University of Applied Sciences(HfT Stuttgart)in 1999,was a consequence of ***’s benevolent promotion of international knowledge transfer in *** topics are reflected in this article;they provide further splashes of color in ***’s oeuvre.

关键词： Vision-based navigation visual odometry photogrammetry and geoinformatics international master’s degree program

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Opportunistic maintenance for multi-component systems considering structural dependence and economic dependence

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Journal of Systems Engineering and Electronics 2015年第3期26卷 493-501页

作者： Junbao Geng michael Azarian michael Pecht College of Power Engineering Naval University of Engineering Center for Advanced Life Cycle Engineering University of Maryland

Although opportunistic maintenance strategies are widely used for multi-component systems, all opportunistic mainte- nance strategies only consider economic dependence and do not take structural dependence into account. An opportunistic main- tenance strategy is presented for a multi-component system that considers both structural dependence and economic dependence. The cost relation and time relation among components based on structural dependence are developed. The maintenance strategy for each component of a multi-component system involves one of five maintenance actions, namely, no-maintenance, a minimal maintenance action, an imperfect maintenance action, a perfect maintenance action, and a replacement action. The maintenance action is determined by the virtual age of the component, the life expectancy of the component, and the age threshold values. Monte Carlo simulation is designed to obtain the optimal oppor- tunistic maintenance strategy of the system over its lifetime. The simulation result reveals that the minimum maintenance cost with a strategy that considers structural dependence is less than that with a strategy that does not consider structural dependence. The availability with a strategy that considers structural dependence is greater than that with a strategy that does not consider structural dependence under the same conditions.

关键词： opportunistic maintenance multi-component system,structural dependence Monte Carlo simulation maintenance cost.

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From“stars”to nano:Porous poly(ethylene glycol)hydrogel films and nanosheets as a versatile platform for sensing and nanofabrication

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Nano Research 2024年第11期17卷 10069-10082页

作者： michael Zharnikov Angewandte Physikalische Chemie Universität Heidelberg Im Neuenheimer Feld 253 D-69120 Heidelberg Germany

The use of bioinert materials is crucially important for medicine and *** most popular systems in this context are oligo-and poly(ethylene glycols)(OEGs and PEGs),applied generally in different forms as bulk materials,thin films,and functional molecular ***,I review the fabrication,properties,and applications of porous hydrogel PEG films(PHFs)and nanosheets(PHNs)formed by thermally activated crosslinking of amino-and epoxy-terminated,star-branched PEG oligomers with variable molecular *** systems possess various useful characteristics,including tunable thickness and porosity,hydrogel properties,bioinertness,robustness,and extreme *** can serve as the basis for composite materials,advanced nanofabrication,and lithography,bioinert supports for high-resolution transmission electron microscopy,susceptible elements in micro-electromechanical systems,and basic building blocks of temperature,humidity,chemical,and biological *** examples of the respective applications are *** though these examples span a broad field-from nanoengineering to biosensing,the applications of the PHFs and PHNs are certainly not limited to these cases but can be specifically adapted and extended to other fields,such as tissue engineering and drug delivery,relying on versatility and tunability of these systems.

关键词： poly(ethylene glycol) hydrogel films bioinertness nanosheets sensors composite materials

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Skeletal muscle-specific Bambi deletion induces hypertrophy and oxidative switching coupling with adipocyte thermogenesis against metabolic disorders

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Science China Life Sciences 2025年

作者： Xiangping Yao Xudong Mai Ye Tian Yifan Liu Guanghui Jin Ze Li Shujie Chen Xiaoshuang Dai Liujing Huang Zijing Fan Guihua Pan Xiaohan Pan Xiangmin Li michael C Yu Jia Sun Jingxing Ou Hong Chen Liwei Xie College of Life and Health Sciences Guangdong Industry Polytechnic Department of Endocrinology and Metabolism Zhujiang Hospital Southern Medical University State Key Laboratory of Applied Microbiology Southern China Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application Guangdong Open Laboratory of Applied MicrobiologyInstitute of Microbiology Guangdong Academy of Sciences Institute of Aging Research Guangdong Provincial Key Laboratory of Medical Molecular Diagnostics School of Medical Technology Guangdong Medical University Department of Hepatic Surgery and Liver transplantation Center of the Third Affiliated Hospital Organ Transplantation Institute Sun Yat-sen University Organ Transplantation Research Center of Guangdong ProvinceGuangdong province engineering laboratory for transplantation medicine Guangdong Provincial Key Laboratory of Liver Disease Research School of Public Health Xinxiang Medical University BGI Institute of Applied Agriculture BGI-Shenzhen Department of Applied Biology and Chemical Technology The Hong Kong Polytechnic University Department of Biological Sciences State University of New York at Buffalo Department of Internal Medicine Shunde Women and Children's Hospital (Maternity and Child Healthcare Hospital of Shunde Foshan) Guangdong Medical University

Skeletal muscle plays a significant role in both local and systemic energy metabolism. The current investigation aims to explore the role of the Bambi gene in skeletal muscle, focusing on its implications for muscle hypertrophy and systemic metabolism. We hypothesize that skeletal muscle-specific deletion of Bambi induces muscle hypertrophy, improves metabolic performance, and activates thermogenic adipocytes via the reprogramming of progenitor of i WAT, offering potential therapeutic strategies for metabolic syndromes. Leveraging the Chromatin immunoprecipitation(ChIP)-seq and bioinformatics analysis, Bambi gene is shown to be a direct target of HIF2α, which is further confirmed by ChIP-qPCR and promoter luciferase assay. Skeletal muscle-specific Bambi deletion led to significant muscle hypertrophy and improved metabolic parameters, even under high-fat diet conditions. This deletion induced metabolic reprogramming of stromal vascular fractions(SVFs) into thermogenic adipocytes, contributing to systemic metabolic improvements, potentially through the secretory ***, mice with skeletal muscle-specific Bambi deletion demonstrate resistance to high-fat diet-induced metabolic disorders, highlighting a potential therapeutic pathway for metabolic syndrome management. Thus, skeletal muscle-specific deletion of Bambi triggers muscle growth, enhances metabolic performance, and activates thermogenic adipocytes. These findings suggest Bambi as a novel therapeutic target for metabolic syndromes, providing new insights into the interaction between muscle hypertrophy and systemic metabolic improvement. The study underscores the potential of manipulating muscle physiology to regulate whole-body metabolism, offering a novel perspective on treating metabolic disorders.

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Geriatric issues in patients with or being considered for implanted cardiac rhythm devices: a case-based review

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Journal of Geriatric Cardiology 2020年第11期17卷 710-722页

作者： michael A Chen Harborview Medical Center University of Washington School of Medicine3259th AvenueBox 359748SeattleWA 98104USA

1 Introduction Virtually all cardiovascular diseases including arrhythmias,valve disease,coronary artery disease and heart failure(HF)are increasingly common with advancing age.^([1])Age and disease-related changes in the heart including fibrosis in the atrial and ventricular myocardium and conduction system,scar tissue from myocardial infarction or other cardiomyopathic processes,increased inflammatory cytokines and changes to ion channels are just some of the factors that predispose older adults to arrhythmias.^([2]).

关键词： Arrhythmias Cardiac implanted electronic devices Older adults Palliative care Syncope

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Microcrack Formation During Gas Metal Arc Welding of High-Strength Fine-Grained Structural Steel

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Acta Metallurgica Sinica(English Letters) 2014年第1期27卷 140-148页

作者： Christoph Heinze Thomas michael Andreas Pittner michael Rethmeier Division 9.3 "Welding Technology" BAM Federal Institute for Materials Research and TestingUnter den Eichen 8712205 BerlinGermany Joining and Coating Technology Fraunhofer-Institute for Production Systems and Design Technology IPKPascalstraβe 8-910587 BerlinGermany

The recent development of high-performance-modified spray arc processes in gas metal arc welding due to modern digital control technology and inverter power sources enables a focused spray arc, which results in higher penetration depths and welding speed. However, rnicrocracks occurred in the weld metal while approaching the process limits of the modified spray arc, represented by a 20-mm double layer DV-groove butt-weld, These cracks were detected in structural steel exhibiting a yield strength level of up to 960 MPa and are neither dependent on the used weld power source nor a consequence of the modified spray arc process itself. The metallographic and fractographic investigations of the rather exceptional fracture surface lead to the classification of the microcracks as hot cracks, The effects of certain welding parameters on the crack probability are clarified using a statistical design of experiment. However, these microcracks do not impact the design specification for toughness in the Charpy V-notch test （absorbed energy at -40 ℃ for the present material is 30 J）.

关键词： High-strength low-alloy steel Welding Fracture Design of experiments Microcracking

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Modelling internal air systems ingas turbine engines

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航空动力学报 2007年第4期22卷 505-520页

作者： J michael Owen Department of Mechanical Engineering University of Bath

Rotating-disc systems can be used to model,experimentally and computationally,the flow and heat transfer that occur inside the internal cooling-air systems of gas turbine *** rotating-disc systems have been used successfully to simplify and understand some of the complex flows that occur in internal-air systems,and designers have used this insight to improve the cooling effectiveness,thereby increasing the engine efficiency and reducing the *** this review paper,three important cases are considered:hot-gas ingress;the pre-swirl system;and buoyancy-induced ***,or ingestion,occurs when hot gas from the mainstream gas path is ingested into the wheel-space between the turbine disc and its adjacent *** seals are fitted at the periphery of the system,and sealing flow is used to reduce or prevent ***,too much sealing air reduces the engine efficiency,and too little can cause serious overheating,resulting in damage to the turbine rim and blade *** the flow is three-dimensional and unsteady,there are encouraging signs that simple ‘orifice models’ could be used to estimate the amount of ingress into the *** a pre-swirl system,the cooling air for the gas-turbine blades is swirled by stationary nozzles,and the air is delivered to the blades via receiver holes in the rotating turbine *** the air reduces its temperature relative to the rotating blades,and the designer needs to calculate the air temperature and pressure drop in the *** designer also needs to calculate the effect of this swirling flow on the heat transfer from the turbine disc to the air,as this has a significant effect on the temperature distribution and stresses in the *** experimental and computational studies have given a better understanding of the flow and heat transfer in these ***-induced flow occurs in the cavity between two co-rotating compressor discs when the temperature of the discs is higher than

关键词：燃气涡轮机车空气动力学数学模型旋转式圆盘系统

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Pillar design and coal burst experience in Utah Book Cliffs longwall operations

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International Journal of Mining Science and Technology 2021年第1期31卷 33-41页

作者： Christopher Mark michael Gauna Mine Safety and Health Administration Technical Support PittsburghPA 15236USA

Longwall mining has existed in Utah for more than half a *** of this mining occurred at depths of cover that significantly exceed those encountered by most other US longwall *** cover causes high ground stress,which can combine with geology to create a coal burst *** every longwall mine operating within the Utah’s Book Cliffs coalfield has been affected by coal *** design has been a key component in the burst control strategies employed by mines in the Book ***,most longwall mines employed double-use two-entry yield pillar ***-use signifies that the gate system serves first as the headgate,and then later serves as the tailgate for the adjacent *** the 1996 burst fatality at the Aberdeen Mine,the inter-panel barrier design was *** this layout,a wide barrier pillar protects each longwall panel from the previously mined panel,and each gate system is used just *** paper documents the deep cover longwall mining conducted with each type of pillar design,together with the associated coal burst *** of the six longwall mining complexes in the Book Cliffs having a coal burst history is described on a panel-by-panel *** analysis shows that where the mining depth exceeded 450 m,each design has been employed for about 38000 total m of longwall panel *** double-use yield pillar design has been used primarily at depths less than 600 m,however,while the inter-panel barrier design has been used mainly at depths exceeding 600 *** its greater depth of use,the inter-panel barrier gate design has been associated with about one-third as much face region burst activity as the double-use yield pillar design.

关键词： Longwall Ground control Coal burst Pillar design Yield pillar

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